Brake-drum construction



Feb. 15 1927. 1,617,781

P. YUNGLING BRAKE DRUM CONSTRUCTION Filed June 9. 1925 "WML/Ww A TTORNEYS.

i Patented Feb. 15, 1927\.`

UNITED STATES PATENT OFFICE.'

PAUL YUNGLIN G, F LOS ANGELE-S, CALIFORNIA, ASSIGNOR TO OIL FIELDS SPEQIAL- TIES COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION 0F CALIFORNIA.

BRAKE-DRUM CONSTRUCTION. f /7 Application led June 9, 1925. Serial No. 35,909.

This invention relates to a brake of the external contracting band type engageable with a brake drum. Such brakes become worn from use, and when applied with much force for a long period of time become 1n many instances excessively hot. The present 1nvention has for its pri mary ob]ect the provision of a'brake of t e type referred to so constructed as to eiliciently conduct and ra- 10 diate from the brake surfaces the heat generated therein. .e

In the drilling of oil w ells`by the rotary method, it is common practice to employ a winch structure for elevating and lowering tools in the hole. Such structures are commonl termed draw worl s. A drum for winding and unwinding the\tool supporting cable is employed. In lowering tools into the hole, the drum is turned by reason of the weight of the string of tools and cable, and

the speed of unwinding is controlled by brakes secured to the drum. Commonly, there is a brake drum on each end of the winding drum and brake bands therefor. Due to the weight of the tools and the great depth of such holes with consequent length of cable, the brake drums become excessively hot, the heat being conveyed to the winding drum and the whole glowing and often iiying to pieces, resulting in injury to the workers and other damage. The embodiment of the invention disclosed herein is intended to be applied to a draw.\vorks. A more specific object of this invention is to provide a drum having a wear and heat insulating lining and to provide in the band a good heat conducting path to the outer surface thereof.

These objects together with other ob]ects and corresponding accomplishments are obtained by meansof the embodiment of my invention illustrated in the accompanying drawing, in which:

Fig. 1 shows a fragment of a'structure for supporting a draw works and an end view of the drum therefor, particularly showing the brake rum and brake band; Fig. 2 `is a fra eitary enlarged end elevation with a wear block holding ring partly broken away to show the brakerdrum construction; and

is a-section as seen on the line 3-3 of Referring more particularly to the drawing\, 5 indicates the drive shaft upon which the drum is mounted, it being arranged so that the drum may be driven thereby or ma idly rotate. Y forms no part of my invention and will not be further described. vThe winding drum is indicated generally by 6 and secured thereto by any suitable means is the brake drum comprising the ring 7 for attachment to the drum' and the cylindrical brake drum Surface 8. Extending transversely of the drum are undercut teeth or tenons 9. The tenons are spaced so as to form dovetail grooves for receiving liner blocks 10. These blocks are slipped into position laterally and held against lateral displacement upon the drum by means of end rings 11 and bolts 12. The blocks 10 should be made of some heat insulating and wear resisting material, such as asbestos. Hard cmpounds of asbestos and slate held together by a suitable binder to form a composite block are well known and will serve the purpose.v Certain hard Woods may also be used. The outer surface of these blocks frictionally engage the brake band 14 This portion of the structure.

which is iiexible and anchored at one end as indicated by 15. The other end of the band is secured to tightening linkage indicated generally by 16. The band disclosed herein is provided with flanges 17 which overhang the blocks. The drum is open so that air may reach the under surface thereof.

In operation, the band is contracted upon the drum against the wear and heat insulating blocks. The heat generated by the frictional resistance of the band against the blocks, due to the character of the blocks, will not travel freely inwardly. However, the band being made of metal such as steel presents a conducting surface and the heat will pass outwardly therethrough to the ambient atmosphere. In the ordinary type of brake of this character the heat travels inwardly heating the drum. Further, it has sometimes been the practice to line the brake band with wear resisting material which drum and a brake band of heat conducting prevents or hinders the heat from passing material wrap ed around said drum and en- 10 outwardly. ga ed vyith said lining.

What I claim is; l n wltness that I claim the foregoing I 5 A brake structure comprising a drum of have-hereunto subscribed my name this 25th relatively high heat conductivity, a lining of day of May, 1925. heat insulating material comprising blocks detachably mounted on the exterior of said PAUL YUNGLING. 

